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Evidence registry

Sources behind the calculations

21 approved records support definitions, formulas, label interpretation, and visible limitations. Competitor references document disagreement only; they are not treated as primary authority.

standards bodyhigh authority

YDKWYDK: Deciphering a yarn label

Craft Yarn Council

Use
definition
Accessed
7/30/2026
Limitations
  • Industry guidance, not a laboratory tolerance specification for packaged yarn.
expert sourcemedium authority

How much yarn do I need for my crochet project?

Dora Does

Use
methodology
Accessed
7/30/2026
Limitations
  • UK-based practitioner source; the mathematical method is unit-independent, but site terminology must be adapted to en-US.
  • The source method is usable, but its displayed worked example contains an apparent inconsistent numerator in the final balls calculation. This pilot relies on the described formula and an independently recalculated example, not that displayed final division.
competitor referencesignal_only authority

Crochet & Knitting Calculator

Jimmy Beans Wool

Use
comparison input
Accessed
7/30/2026
Limitations
  • Competitor comparison only; not used as sole factual authority.
competitor referencesignal_only authority

Crochet Yarn Calculator - How Much Yarn Do I Need?

CrochetYarnCalculator.com

Use
comparison input
Accessed
7/30/2026
Limitations
  • Competitor comparison only; several unsourced claims on the page are excluded.
  • The page also makes unsupported accuracy and generic consumption claims; none are reused.
expert sourcemedium authority

How much yarn do I need for my crochet project?

Dora Does

Use
methodology
Accessed
7/31/2026
Limitations
  • The page contains an arithmetic inconsistency in one worked example; this batch uses independently derived formulas and tests, not that numerical result.
competitor referencesignal_only authority

Yarn Calculator: Calculate Yardage, Cost and Gauge

B.Hooked Crochet & Knitting

Use
comparison input
Accessed
7/31/2026
Limitations
  • A competitor recommendation is not an industry standard and cannot establish a universal margin.
standards bodyhigh authority

YDKWYDK: Deciphering a yarn label

Craft Yarn Council

Use
definition
Accessed
7/31/2026
Limitations
  • Label values describe the packaged product and can be affected by manufacturing tolerances; they are not a measurement of every individual ball.
competitor referencesignal_only authority

Crochet and Knitting Calculator

Jimmy Beans Wool

Use
comparison input
Accessed
7/31/2026
Limitations
  • A retailer recommendation is not an industry standard and conflicts with other public conventions.
standards bodyhigh authority

Top 10 Yarn Questions & Answers

Craft Yarn Council

Use
definition
Accessed
7/31/2026
Limitations
  • General guidance; it does not provide a safe universal method for rewriting shaped patterns.
manufacturermedium authority

How to Measure Crochet Gauge

Yarnspirations

Use
methodology
Accessed
7/31/2026
Limitations
  • Manufacturer tutorial; treatment and project-specific instructions still control.
standards bodyhigh authority

Yarn and project basics

Craft Yarn Council

Use
background only
Accessed
7/31/2026
Limitations
  • Not all yarns use dye lots; users should inspect the product label.
standards bodyhigh authority

Crochet Hook and Knitting Needle Standards

Craft Yarn Council

Use
methodology
Accessed
7/31/2026
Limitations
  • Changing hook size can affect fabric character and is not guaranteed to solve every gauge mismatch.
standards bodyhigh authority

Standard Yarn Weight System

Craft Yarn Council

Use
definition
Accessed
7/31/2026
Limitations
  • The chart provides ranges and labeling conventions; it does not predict an individual crocheter’s fabric or exact yardage.